Silencer for internal-combustion engines.



f M. F. G'RAYDON. 8ILBNQER FOR INTERNAL COMBUSTION ENGINES.

APPLIOATIOH FILED OUT. 9, 1911.

Patented Feb. 13, 1912.

MARK FRANK GRAYDON', 0F TRENTON, ONTARIO, CANADA.

SILENGER FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Application filed October 9, 1911.

Patented Feb. 13, 1912.

Serial No. 653,730.

Toell whom it may concern:

Be it known that I, MARK FRANK GRAY- noN, of the town of Trenton, in thecounty of l lastings, in the Province of Ontario, Canada, have inventedcertain new and use to] Improvements in Silencers for Internal-Combustion Engines, of which the following is the specification.

My invention relates to improvements in silencers for internalcombustion engines and the object of the invention, is to devise asilencer, which can be applied to the exhaust pipe of an engine inconjunction with any form ofmufller or expansion chamber at present inuse.

The invention consists of a. valve seat so cured to the end of theexhaust. pipe, a valve having a stem extending into the exhaust pipe, aspring on the stem for holding the valve normally in a closed positionagainst the valve seat and a casing secured to the valve seat having a.suitable exhaust aperture therein all as hereinafter more particularlydescribed and illustrated in the nominpanying drawing in which Figure 1,represents a side view of asilencer constructed according to myinvention. Fig. 2, is av section through the casing thereof. Fig. 3, isa similar seetion to Fig. 52 through casing and pipe showing the valveexposed. Fig. 4, is a. perspective detail ot the valve. seat. Fig. 5,isa perspective detail of the valve, the stem of which is broken awayintermedially. F 1g. (3. is a similar View to Fig. 5 of an alternativeform of secui'ing the spring on the stem of the valve. Fig 7, is a sideelevation showing the device applied to exhaust pipe and niuftler.

Like letters of reference indicate corresponding parts in the differentviews.

1 is the exhaust pipe, and 2 is the valve seat internally threaded at 3,said valve seat portion being screwed on the exhaust pipe 1.

4 is an enlarged externally threaded portion of the valve seat.

5 is the easing with an exhaust aperture 6 therein and having aninternal threaded portion 7 designed to be screwed onto the enlargedportion 4.

9 is the valve seating on the valve seat portion 2 and 10 is the stemthereof extend ing into the exhaust pipe 1.

11 is aspider acting as a hearing forthe valve and formed in the hollowinterior I! of the valve seat.

13 is a spring mounted on the valve stem 10 and 14- is a pin forscouring the spring thereon.

15 is a niuttler or expansion ehamher of suitable form connected in theexhaust he tw the engine and the silencer.

16 (Fig. 6) is a reduced shank on the end of the stem 10 "and 17 is anut threaded thereon and designed to secure the spring I? on the stem 10as {in alternative form to the pin 14 (Fig.

It found that when a. device of the nature devised is applied to the endof an exhaust pipe of on internal eoiuhustion eugino in conjunction withthe mutiler or other suitable expansion ehamher now rrorrnnonly used,the noise of the exhaust materially decreased without an appreciablereduw tion of power in the engine.

T he operation of the de ice is .t'ollovv -The exhaust gases rushingagainst the vulvh raises the same off the seat thus ullowing the gasesto est-ope into the casing and thence thrmigh the exhaust aperture intothe air, the valve closing instantaneously thus preventing an inrush ofair Whirh it is claimed is largely responsible for the noise of theexhaust.

Many nimliiieaticms may he made in the invention without departing fromthe spirit of the some or the scope of the claims and the form shown isto be taken in an illus-- trative and not in a limiting sense.

hat I claim as my inventi n 1:

1. In a silencing deiiee for internal ('omhustion engines having anexhaust pipe, a valve seat secured to the exhaust pipe, a spider scouredto the valve seat, a valxe, a stem on said valve slirlahly' mounted inthe spider, and means for holding the valve in a normal closed positionagain t the valve seat and an expansion eas ng having a dome shaped topand an exhaust aperture below said top. as and for the purposespecified.

2. In a sileneing devit'e for internal com.- hustion engines having anexhaust. pipe, a valve sent embracing the discharge end of said exhaustpipe, a spider sevured to the iii-- ner upper edge of said valveseat on.extending Within said exhaust pipe, :1 1 one, a stem on said valveslidnhly mounted in said spider, a pin passing though the end of saidstem, and a spring hearing against said pin at one end and against saidspider at 1 I A subaidiery silencer for internal comthe other endadapted for holding the valve in normally closed position against thevalve seat and an expanslon casing having a doom shaped top and anexhaust aperture below said top.

3. In a silencing device for internal 0on1- bustion engines, thecombination with the exhaust pipe and mutller, of a subsidianv silencercomprising a hollow valve seat secured to the exhaust pipe, a spiderformed in the interior of the valve seat, a valve above the valve seat,a stem extending below the valve and slidably mounted in the spider, anda spring mounted on the stem for holding tinvalve in a normally closedposition against the valve seat and an expansion casing hm ing a domeshaped top and an exhaust aperture below said top as and for the purposespecified.

4. In a silencing device for internal combustion engines, thecombination with the exhaust pipe and mufller, of a subsidiary silencercomprising a hollow valve seat cured to the exhaust pipe and having anenlarged externally threaded portion at the top thereof, a spider formedin the interior of the valve seat, a valve above the seat, a stemextending below the valve and elidably mounted in the spider, and aspring mounted on the stem for holding the valve in a normally closedposition against the valve seat and an expansion casing having a domeshaped top and an exhaust a wrture below said top as and for the pur msespecified.

l l l hustion engines; comprising a hollow valve seat secured to theexhaust pipe and having an enlarged externally threaded portion at thelop thereof, a spider it'orn'led in the interior of the valve seat, avalve above the seat, a stem extending below the valve and slidablymounted in the spider, and a spring mounted on the stem for holding thevalve in a nm'iually closed position against the ulve seat and anexpansion easing having a dome Jshaped top and an exhaust aperture belowsaid top as and for the purpose specified.

U. in a silencing device for internal combustion engines having anexhaust pipe, an internally threaded hollow valve seat cured to theexhaust pipe T shaped in cross section :l'nrming inner and outer annularehouhlors, said outer shoulder being provided with threads, a spiderintegrally formed on said valve seat and depending within the exhaust, avalve above the seat, a stem below the valve and slidably mounted in thespider, a spring mounted on the stem for holding the valve in a normallyclosed position against the valve seat, and a dome shupedl easing screwthreaded upon said outer flange having a laterally discharging exhaustaperture below the top of said cas- MARK FRANK GRAYDON.

\Vitnesse.

P. J. ORonniin, J. F. X. OROURKE.

